I created a calculated field earlier today that is simply SUM([Successful Classes]) / COUNT([Enrolled Classes)] to find the overall success rate for students. I would like to though create a visual comparing development student success rates vs the entire student population....OR the student population sans development students.

Not your fault! So it appears to have worked.....BUT (there's always a 'but') none of the values are showing up! Here are two snapshots of the work. I am sorry for the hassle but thank you for the help!

The reason why I was trying to do it the other way was for ease of use. I would like to be able to have a graph where I can look at the success rate for dev students and the success rate for all other students and potentially een loop in the success rate for all students in comparison. Right now, like you alluded to, I can create a filter based on whether the student is a dev student or not. While that is all well and good for a number of things I will be showing, I would prefer to be able to show them both at the same time without worrying about filtering.